Staia presented a known system to target, not a fragmented mess of ever changing 'distributions' that don't even attempt to maintain binary compatibility for a single release.
Distributions do maintain binary compatiblity for base system libraries. They do not bother with binary compatibility for additional libraries that are there to support the applications shipped with the distro. You wanting those libraries to be part of the Linux desktop ABI does not mean that there is no stable Linux desktop ABI.
I'm not sure what Stadia includes in their base system but if they have any interest in long-terms maintenance then I'd expect that the base system is minimal and everything else is bundled with the game - even if provided by an SDK.
